Effects of handicraft sitting postures on lower trunk muscle fatigue

Details

• Personal Author:
  Areeudomwong P ; Chatchawan U ; Kaber DB ; Leelayuwat N ; Puntumetakul R ; Wanpen S
• Description:
  The purpose of this study was to assess trunk muscle fatigue in seated handicraft tasks using surface electromyography (sEMG) and visual analogue scale (VAS) ratings for trunk discomfort, and to assess the relationship of these responses. Twenty-three participants were randomly assigned to assumed crossed-leg and heel sitting postures for 30 min. Normalised median frequency (NMF) slopes for lumbar multifidus (LM) and internal oblique (IO) muscles and VAS ratings were recorded. Results revealed that the crossed-leg posture produced significantly steeper NMF slopes for both sides of the LM and IO muscles than heel sitting. Greater VAS ratings were found in crossed-leg sitting posture than the heel sitting posture. The NMF slopes and the VAS ratings had significant negative correlations for both postures. Findings support heel sitting in handicraft tasks over crossed-leg sitting due to greater trunk muscle fatigue and discomfort during the latter posture. Results support VAS ratings as a complementary method to sEMG for identifying trunk muscle fatigue. Practitioner Summary: Trunk muscle fatigue in handicraft work is a potential risk for low back pain. Based on EMG and discomfort analyses, heel sitting is preferred to crossed-leg posture. Discomfort ratings are consistent with EMG measures in identifying trunk muscle fatigue in such postures. [Description provided by NIOSH]
• Subjects:
  Aging Ergonomics Fatigue Men Musculoskeletal System Occupational Health Risk Assessment Risk Factors Safety Women
• Keywords:
  Age-groups Author Keywords: Trunk Muscle Fatigue Body Discomfort Exposure-levels Humans Muscle-function Muscles Musculoskeletal-system Normalised Median Frequency Slope Physiological-effects Physiological-fatigue Physiology Posture Risk-factors Statistical-analysis Surface Electromyography Visual Analogue Scale

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• ISSN:
  0014-0139
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  North Carolina ; OSHA Region 4
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  55
• Issue:
  6
• NIOSHTIC Number:
  nn:20041525
• Citation:
  Ergonomics 2012 Jun; 55(6):693-703
• Email:
  rungthip@kku.ac.th
• Federal Fiscal Year:
  2012
• Performing Organization:
  University of North Carolina, Chapel Hill
• Peer Reviewed:
  True
• Start Date:
  20050701
• Source Full Name:
  Ergonomics
• End Date:
  20270630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:3372924f7132859fbbafe088e1881ccc88cb127f4002085e0c7b63804e8bd6fc331978902daafc6a2bd52d5746adf5c3a7b4ef3ce62388d20ef61b5300503962
• Download URL:
  https://stacks.cdc.gov/view/cdc/194069/cdc_194069_DS1.pdf
• File Type:
  [PDF - 511.02 KB ]